We do not want to change the default value of the filter. The default value is currently set to “no change”. We don’t want people to apply the filter and then see their colors all messed up. Instead, we need to change the scaling of the UI controls so that the user has a wider range to operate in.
I’m literally working on this right now. I am modifying all the spinners to go from -100% to +100% with 0% being “no change” (default).
If you want to test and maybe modify the code changes in your build environment, you would need to install Git Bash. Then, in the Git Bash terminal, cd to the shotcut directory and then run: $ git pull